Pshnaw
A simple phrased used by a person who wants to say 'no' in a dismissive manner. It is a mixture of 'psh' which means 'whatever' and 'naw' which means 'no'.
Person 1: "Yo did you and that chick hook up last night?"
Person 2: "Pshnaw...she wasn't my type anyway."
Person 2: "Pshnaw...she wasn't my type anyway."